Field-tunable stochasticity in the magnetization reversal of a cylindrical nanomagnet

TL;DR

This study investigates how the magnetization reversal process in a cylindrical nanomagnet varies with the magnetic field orientation, revealing a tunable stochastic behavior between multimode and single-step switching modes.

Contribution

It demonstrates the field-direction dependence of stochastic reversal modes in cylindrical nanomagnets using time-resolved magnetoresistance measurements.

Findings

Reversal mode is highly stochastic, switching via multimode or single-step.

Stochasticity depends on magnetic field alignment, transitioning from multimode to single-step.

Reversal behavior can be tuned by rotating the magnetic field relative to the nanowire axis.

Abstract

The nature of magnetization reversal in an isolated cylindrical nanomagnet has been studied employing time-resolved magnetoresistance measurement. We find that the reversal mode is highly stochastic, occurring either by multimode or single-step switching. Intriguingly, the stochasticity was found to depend on the alignment of the driving magnetic field to the long axis of the nanowires, where predominantly multimode switching gives way to single-step switching behavior as the field direction is rotated from parallel to transverse with respect to the nanowire axis.